The Lee Double Disk Kit for Lee Auto-Disk Powder Measure serves to raise the hopper of your Lee Pro Auto-Disk Powder Measure, which enables you to stack two separate disks. Not only does this multiply the capacity of your Auto-Disk Powder Measure by two, but it also makes it possible for you to make super-fine adjustments. Most powder measures allow for 0.1-grain adjustments by stacking additional disks in a certain combination. Included in the Lee Double Disk Kit for Lee Auto-Disk Powder Measure are four extra disks, screws, risers, and a complete list of the possible combinations.